单项选择题

TCP/IP在多个层次引入了安全机制，其中TLS协议位于。

A．数据链路层
B．网络层
C．传输层
D．应用层

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单项选择题

（）, the brains of a computer, it contains the ALU, the clock, many registers, the bus interface, and circuitry that makes these pans work together.

A. I/O device
B. CPU
C. Memory
D. Operating system

单项选择题

In C language, there are several methods of communicating data between functions, one of which is by（）。

A. arguments
B. variables
C. messages
D. constants

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